Distribution of Two Intertidal Gastropods, Batillaria multiformis and B. cumingi (Batillariidae) at a Co-occurring Area

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  • ADACHI Naoko
    Department of Biological Science, Faculty of Science, Nara Women's University
  • WADA Keiji
    Department of Biological Science, Faculty of Science, Nara Women's University

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  • ウミニナとホソウミニナの混生域における分布
  • Distribution of Two Intertidal Gastropo

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Distributions of two intertidal gastropods, Batillaria multiformis (Lischke) and B. cumingi (Crosse), were studied in relation to intertidal height and vegetation on a tidal flat where they co-occurred. B. multiformis occurred abundantly in the intertidal higher level, while B. cumingi did in the lower level around low tide shore line. In areas with halophilous plants, the two species tended to segregate to each other with regard to plant species. Laboratory experiment indicated that B. cumingi preferred to stay in water to more extent than B. multiformis, corresponding with the distributional difference in intertidal height between the two species.

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